The Hornady .257 Wby Mag Unprimed Rifle Cartridge Cases offer an exceptionally uniform and premium structural foundation for precision handloaders developing custom ammunition for the high-velocity Weatherby platform. Manufactured in small, specialized lots under rigid quality control standards, this high-grade rifle brass ensures excellent case-to-case consistency in internal volume, weight, and wall dimensions. Every case features precision-measured tight wall concentricity to minimize bullet runout and guarantee an ideal chamber fit, facilitating a clean, identical projectile release upon ignition. To withstand demanding long-range pressures, Hornady subjects this component brass to rigorous pressure calibration testing to promote completely uniform case expansion during firing. Packaged as a loose component box of 50 unprimed brass cases, this American-made product features a standard Large Rifle primer pocket profile to give extreme long-range hunters and precision rifle competitors total command over their ignition properties.